Galvanic cell.



. "STATES PATENT OFFICE.

ionnncirn KAP AN, or BRQOKLYN, new Yoim-as'sieNon irolnnaco'n nmu'runn qnmacrnro 00., INC., on NEW roan, n. Y; A"COB,PQRATIQ1\I"0F NEW (YouALVANIQ-CELLi dent of 'Brodklvn, in the county of Kings" and State ofNew York, have invented certain new and useful Improvements in- Gal-"vanic Cells, of which the following is a specification. e This inventionrelates to galvanic cells of the Leclanche type especially to the formknown as the dry battery and in particular asmall' portable type ofbattery called the rniniature cell and is concerned more directly withthe depolarizing portion of. such galvanic cell all as more particularlyhereinafter described in detail and as set forth in.- the appendedclaims.

It is customary to make use of manganese peroxid both .the natural andartificially prepared as a depolarizing agent in cells of salts such aspotassium hydrogen sulfate or difi'erent types and in Letters Patent No.1,109,129 granted to me Sept. 1, 1914, I have disclosed a form ofInangaxnese material, namely, manganous polymanganite which may be usedas a depolarizing agent. Such product was illustratively preparedbyreacting with a manganous salt on bluehydrated potassium manganite.

According to the present inventlon an acid salt of polymanganic acidpreferably. themangan'ous salt is employed as a depolariz ing agentpreferably in con unction wlth graphite or other form of conductingcarbon preferably in certain proportions as will be hereinafter setforth. p I .The acid manganous polymangamte may be' regarded assomeWhatsimiIar toacid sodium bisulfate and the like. It has theadvantage of a certain measure of reactivity due to-its acid characterand to I its porous though dense texture as to make it of importance asa depolarizing agent H -Acid manganous polymangarnte may be prepared byreacting on manganous polymanganite or manganous potassium polymanganitewith dilute acid n amount suflicient to remove approximately one-half onthe combined base. plished by'suitable digestion, filtration andApplication filed May 1,1915. Seiialo. 25,164.

a larizing agent.

This may be acc0m-' freed from water-soluble material, may be and ifdesired maybe rendered anhydrous.

- Speciiic'ation ofne s' -ta jf tflf 115533 1 15;

' -Washing-and the acid salt largely orwholly This material isincorporated with for example finely divided. graphite preferably in theproportion of six'parts of the .former to four parts ofthe'latter and-iscompressed into the shape. desired as a depolarizing" mass. Ordinarilythe depolarizing'material -1s molded-around a rod ofcarbon Whichisintroduced into a single container in. which the electrolyte is placed.v

Owing to the acid character of the manganous salt producedtheflmat'erial reacts "with hydrogen to most excellent advantage.

Whether or not thisxpeculiar degree of reactlvity is due to somecondition of ioniza-- --tion has not been determined by me but Ibelieve-when the galvanic cell is in operation a certain slight degreeof dissociation oc curs which gives rise to ions of a highly responsivenature which enables auto-reduction of the depolarizlng mass to progressra i dlv and efl'ectivel sotha olarization is entirely prevented. Ina.miniature battery this conditionisof great importance because thedemands on such batteryof small compass-are very great-and polarizationof active depolariz ers.

\Vhat I claim is: v 1; A galvanic cell containing acid man the electrodeoftentimes occurs with less re agent.

ganous polymanganite as a depolarizing 2. A galvanic cell containing'anacid salt of polyma'nganic acid as v a depolarizing agent. I r I 3. Agalvanic cell containing anon-neutral salt of polym'angan c acid as adepo- 4. A galvanlc cell containing acid nian- 5.- As av depolarizlngagent a mixture of conducting carbon and an acidsalt of polymanganicacid. y

6, As a degmlarizmgv agent a mixture of mangamt being in he rat-i0 0f'abcui; ion" to sum Iew Yak in the county of New York and. State of NewYork, this 28th day of April, A. D. 1915. I v

v 7 MQRDUCH L. KAPLAN.

Witnesses:

ARTHUR MARION, CHAS. C.

